Equivalent & Substitute Parts: 3FTH905

Part Overview

The 3FTH905 is a tactile switch from MEC Switches' Multimec® 3 series, configured as a SPST-NO (Single Pole Single Throw - Normally Open) momentary contact switch. This component is rated for 0.05A at 24VDC and features top-actuated plunger operation with illumination capability. The 3FTH905 is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure ongoing component availability for production and service applications.

Substiute Parts

3FTH905

MEC SwitchesIn Stock: 8193FTH905 Datasheet

Current PartRFQ

3FTH906

MEC SwitchesIn Stock: 11173FTH906 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3FTH905 is determined by strict equivalence across all electrical and mechanical parameters. The primary substitute identified is the 3FTH906, which maintains identical specifications in the following critical areas:

Electrical Parameters:

• Circuit configuration: SPST-NO
• Switch function: Off-Mom (Momentary)
• Contact rating: 0.05A @ 24VDC

Mechanical Parameters:

• Mounting type: Through Hole
• Actuator type: Plunger for Cap
• Actuator orientation: Top Actuated
• Actuator height: 10.40mm
• Outline dimensions: 10.10mm x 10.10mm
• Termination style: PC Pin
• Operating force: 357gf
• Switch travel: 1.00mm
• Mechanical life: 10,000,000 Cycles

Environmental Parameters:

• Operating temperature range: -20°C ~ 80°C
• Ingress protection: IP67
• Actuator material: Polyphenylene Sulfide (PPS)
• Moisture sensitivity level: 1 (Unlimited)

The 3FTH906 differs from the 3FTH905 only in product status (Active versus Obsolete) and illumination specification detail (LED, Blue at 3.3VDC nominal versus unspecified illumination type). These differences do not affect functional substitution capability.

Parameter Comparison

Engineering Selection Recommendations

The 3FTH906 is the direct functional equivalent for the obsolete 3FTH905. Selection of the 3FTH906 is supported by the following engineering considerations:

Product Status: The 3FTH906 maintains Active product status with MEC Switches, ensuring ongoing availability and manufacturer support. The 3FTH905 is classified as Obsolete, creating supply chain risk for new production and field service applications.

Electrical and Mechanical Equivalence: All critical electrical parameters (circuit configuration, contact rating, switch function) and mechanical parameters (mounting type, actuator geometry, operating force, switch travel, mechanical life) are identical between the two components.

Environmental Compliance: Both components carry identical environmental ratings (IP67 ingress protection, -20°C ~ 80°C operating temperature range, MSL 1) and export classifications (ECCN EAR99, HTSUS 8536.50.9031).

Illumination Specification: The 3FTH906 provides explicit illumination specification (LED, Blue at 3.3VDC nominal), whereas the 3FTH905 illumination type is unspecified. This clarification in the substitute part enhances design documentation accuracy.

PCB Layout Compatibility: Identical outline dimensions (10.10mm x 10.10mm), actuator height (10.40mm), and termination style (PC Pin) ensure direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the 3FTH906 be used as a direct replacement for the 3FTH905 in existing designs?

A: Yes. The 3FTH906 is electrically and mechanically equivalent to the 3FTH905. All critical parameters including circuit configuration, contact rating, mounting type, actuator geometry, and environmental ratings are identical. PCB layout modifications are not required.

Q: What is the primary difference between the 3FTH905 and 3FTH906?

A: The primary difference is product status: the 3FTH905 is Obsolete, while the 3FTH906 is Active. Additionally, the 3FTH906 specifies illumination type as LED, Blue at 3.3VDC nominal, whereas the 3FTH905 illumination type is not specified.

Q: Are the illumination specifications compatible between these two parts?

A: Both components are specified as Illuminated. The 3FTH906 provides explicit illumination specification (LED, Blue at 3.3VDC nominal). If the original design utilized the 3FTH905 illumination feature, the 3FTH906 illumination characteristics must be evaluated for compatibility with the circuit design, particularly regarding voltage supply and color requirements.

Q: Do these components have identical mechanical life ratings?

A: Yes. Both the 3FTH905 and 3FTH906 are rated for 10,000,000 mechanical cycles, indicating equivalent durability and operational lifespan.

Q: Are there any environmental or compliance differences between these parts?

A: No. Both components share identical environmental ratings (IP67 ingress protection, -20°C ~ 80°C operating temperature range, MSL 1) and export classifications (ECCN EAR99, HTSUS 8536.50.9031).

Q: What is the operating force specification for these switches?

A: Both the 3FTH905 and 3FTH906 require an operating force of 357gf (gram-force) with a switch travel of 1.00mm.

Q: Are these components suitable for through-hole PCB assembly?

A: Yes. Both components are specified for Through Hole mounting with PC Pin termination style, compatible with standard through-hole PCB assembly processes.